What does a nucleotide consist of?Protein-sugar-basePhosphate-sugar-baseAmino acid-sugar-baseProtein-phosphate-base2There are four different bases in DNA, which always pair up in a particular way. Which of the following shows the correct complementary base pairing? A-X and G-CT-A and G-CA-A, C-C, T-T and G-GA-G and T-C3What takes place during transcription?DNA unwinds and mRNA copy is mademRNA threads through a ribosometRNA molecules bring amino acids together to form a chainAmino acid chain folds up to form a protein4In which part of the cell does translation take place? Cell membraneNucleusMitochondriaRibosome5Which of the following statements about protein synthesis is incorrect? Proteins are made up of amino acidsThe amino acids that make up a protein can be connected in any orderThere are about 20 different amino acidsEach group of three bases codes for one amino acid6What term describes a change in a gene or chromosome? An alterationA switchA natural selectionA mutation